I have several JSAs of the great Brian Wilson, but they all date back over 20 years ago and his health has deteriorated significantly since then so it's quite possible that this is what his more recent sig has devolved into.
Still, I'd be skeptical without having a more recent genuine exemplar to compare it to.
Thank you! I appreciate your comment about the Brian signature.
I'd like to get it verified by JSA or one of those companies. I don't know anything about the process. I'm in the UK, but the trusted companies seem to all be based in the US, so I reckon it would be costly with postage etc. I'll look into it!